By Adnan A.
Multiple Choice
1. Most of chlorine and sodium hydroxide that are produced commercially is done by which process?
a. Chlor-Alkali Process b. Galvanic Separation c. Electrolysis of Molten Salt d. Electrolysis of Water
2. The process that takes place in an electrolytic cell is called _ .
a. Electrolysis b. Ionization c. Electric Production d. Fission
3. You could describe and electrolytic cell as a cell that converts into chemical energy
a. Electrical Energy b. Mechanical Energy c. Kinetic Energy d. Ionization Energy
Short Answer
1. Why would a salt bridge be needed in a electrolytic cell made of two half-cells?
2. What is the main difference between a Galvanic cell and an Electrolytic cell?
ANSWERS Multiple choice1. A2. A3. A Short Answer1. The salt bridge would be required so that the solution inside the salt bridge can seep into the solution of the half-cell to neutralize the charge and keep the electrons flowing.2. A galvanic cell produces electricity from chemical energy whereas an electrolytic cell uses electrical energy to drive non spontaneous redox reactions.
_ By Xinli Tu
MULTIPLE CHOICE
1. Sir Humphry Davy built a large galvanic cell and used it to perform electrolysis experiments because he wanted to a) Understand how water is subjected to electrolysis b) Help him convert galvanic cells into electrolytic cells c) Observe the nature of electrolytes that are dissolved in aqueous solutions d) Reduce metal ions in salts to produce the pure metals
2. Which factors affect rate of reaction for the electrolysis of water a) The use of pure water b) The use of salts c) Concentration of reactants d) A and B e) B and C f) All of the above
3. Chlor-Alkali process is an electrolysis procedure for making _ from brine (Fill in the blank) a) Chlorine gas and sodium hydroxide b) Calcium chloride and oxygen gas c) Calcium chloride and hydrogen gas d) Copper sulphate and oxygen gas
SHORT ANSWERS
4. What occurs at the anode and cathode when water undergoes electrolysis?
5. How is pure sodium (salt) obtained if sodium cannot be purified by electrolysis in an aqueous solution?
ANSWERS 1. D2. F3. A4. Some water molecules are oxidized at the anode and other water molecules are reduced at the cathode Oxygen gas is generated at the anode and hydrogen gas is generated at the cathode5. Salts are solid at standard temperature and will not conduct electric current. Therefore, salts are heated until they melt and are applied in electrolysis to the molten solids. Since there is no water present, it could not interfere with the reactions and would ultimately help isolate for salts such as sodium. By: Andrew Vyravipillai
MULTIPLE CHOICE: 1. An electrolysis reaction is: a) used to produce electrical energy to power many small appliances b) a non-spontaneous reaction that can be used as a source of electrical energy c) an exothermic redox reaction powered by an external power supply d) a spontaneous reaction that can be used to convert chemical energy into electrical energy.
2. A battery consists of which type of cells: a) electrolytic b) electroplating c) electrochemical d) galvanization
3. Which of the following is FALSE concerning redox reactions? a) the cathode is where reduction occurs b) the oxidizing agent is reduced c) the anode is oxidized d) cations migrate to the anode
SHORT ANSWER:
4. Explain what occurs during the chlor- alkali process?
5. When water is subjected to electrolysis, the volume of the hydrogen gas is twice as great as the volume of the oxygen gas. Explain why?
Answer Key:
1. B
2. C
3. D
4. In the chlor-alkali process, the chloride ions, which are at the anode lose their electrons and become neutral atoms that combine to form chloride molecules. The water molecules pick up the electrons from the cathode and form hydroxide ions and hydrogen atoms. The hydrogen atoms combine to form hydrogen molecules.
5. The number of electrons gained during reduction must be the same as the number of electrons lost during oxidation. The reduction reaction occurs twice for every oxidation reaction, therefore 2 mol hydrogen gas is produced for every 1 mol oxygen gas, increasing the volume. Abinethaa Paramasivam Wiki Short Answer Questions 1)Explain how sodium can be purified by electrolysis. Sodium can be purified by electrolysis by heating the salt until it melts and is applied to electrolysis as a molten solid. The reaction produces sodium by reduction at cathode and chlorine by oxidation at anode. 2) Describe one factor that affects electrolysis of water. In the electrolysis of water, pure water should not be used, because it is a poor conductor of electricity. Therefore, the reaction rate will be much more slower. To increase the rate of reaction, a salt should be used which will conduct current but not interfere with the reactions. For instance, sodium sulfate can be used.
Multiple Choices 1)Who built a large galvanic cell and performed electrolysis experiments with it? a) Sir Humphrey Dumpy b) Sir Humphry Davy c) Alessandro Volta d) None of the Above Answer: B
2)Which of the following is the correct statement about Chlor-Alkali Process? a) Sodium ions from chlorine lose electrons b) Chloride ions from sodium chloride gain their electrons at anode c) Chloride ions from sodium chlorine lose their electrons at anode d) Hydrogen atoms combine to form water molecules Answer: C
Udari Premachandra
1. What are the two metals extensively produced for commercial purposes?
a) Potassium bromide and chlorine
b) Barium hydroxide and chlorine
c) Sodium hydroxide and chlorine
d) Calcium hydroxide and chlorine
2. What is NOT one of the uses of chlorine?
a) Used to make PVC
b) Used to break down lignin in woods
c) Used to make soaps and detergents
d) Production of ammonium
3. Which of the following is NOT one of the elements Sir Humphry Davy was able to isolate using electrolysis?
a) Sodium
b) Calcium
c) Barium
d) Beryllium
4. How did Sir Humpry Davy find out how pure sodium was obtained?
5. How can you increase the rate of reaction for electrolysis?
Answers:
1. C
2. D
3. D
4. Sir Humphry Davy found how pure sodium was obtained by heating the salts until they melted and then decided to apply electrolysis to the molten solids. Furthermore, since no water was present, it could not interfere with the reactions.
5. You can increase the rate of reaction by using a salt that will conduct current but will not interfere with the reactions.
Multiple Choice
1. Most of chlorine and sodium hydroxide that are produced commercially is done by which process?
a. Chlor-Alkali Process b. Galvanic Separation c. Electrolysis of Molten Salt d. Electrolysis of Water
2. The process that takes place in an electrolytic cell is called _ .
a. Electrolysis b. Ionization c. Electric Production d. Fission
3. You could describe and electrolytic cell as a cell that converts into chemical energy
a. Electrical Energy b. Mechanical Energy c. Kinetic Energy d. Ionization Energy
Short Answer
1. Why would a salt bridge be needed in a electrolytic cell made of two half-cells?
2. What is the main difference between a Galvanic cell and an Electrolytic cell?
ANSWERS
Multiple choice1. A2. A3. A
Short Answer1. The salt bridge would be required so that the solution inside the salt bridge can seep into the solution of the half-cell to neutralize the charge and keep the electrons flowing.2. A galvanic cell produces electricity from chemical energy whereas an electrolytic cell uses electrical energy to drive non spontaneous redox reactions.
_
By Xinli Tu
MULTIPLE CHOICE
1. Sir Humphry Davy built a large galvanic cell and used it to perform electrolysis experiments because he wanted to
a) Understand how water is subjected to electrolysis
b) Help him convert galvanic cells into electrolytic cells
c) Observe the nature of electrolytes that are dissolved in aqueous solutions
d) Reduce metal ions in salts to produce the pure metals
2. Which factors affect rate of reaction for the electrolysis of water
a) The use of pure water
b) The use of salts
c) Concentration of reactants
d) A and B
e) B and C
f) All of the above
3. Chlor-Alkali process is an electrolysis procedure for making _ from brine (Fill in the blank)
a) Chlorine gas and sodium hydroxide
b) Calcium chloride and oxygen gas
c) Calcium chloride and hydrogen gas
d) Copper sulphate and oxygen gas
SHORT ANSWERS
4. What occurs at the anode and cathode when water undergoes electrolysis?
5. How is pure sodium (salt) obtained if sodium cannot be purified by electrolysis in an aqueous solution?
ANSWERS
1. D2. F3. A4. Some water molecules are oxidized at the anode and other water molecules are reduced at the cathode Oxygen gas is generated at the anode and hydrogen gas is generated at the cathode5. Salts are solid at standard temperature and will not conduct electric current. Therefore, salts are heated until they melt and are applied in electrolysis to the molten solids. Since there is no water present, it could not interfere with the reactions and would ultimately help isolate for salts such as sodium.
By: Andrew Vyravipillai
MULTIPLE CHOICE:
1. An electrolysis reaction is:
a) used to produce electrical energy to power many small appliances
b) a non-spontaneous reaction that can be used as a source of electrical energy
c) an exothermic redox reaction powered by an external power supply
d) a spontaneous reaction that can be used to convert chemical energy into electrical energy.
2. A battery consists of which type of cells:
a) electrolytic
b) electroplating
c) electrochemical
d) galvanization
3. Which of the following is FALSE concerning redox reactions?
a) the cathode is where reduction occurs
b) the oxidizing agent is reduced
c) the anode is oxidized
d) cations migrate to the anode
SHORT ANSWER:
4. Explain what occurs during the chlor- alkali process?
5. When water is subjected to electrolysis, the volume of the hydrogen gas is twice as great as the volume of the oxygen gas. Explain why?
Answer Key:
1. B
2. C
3. D
4. In the chlor-alkali process, the chloride ions, which are at the anode lose their electrons and become neutral atoms that combine to form chloride molecules. The water molecules pick up the electrons from the cathode and form hydroxide ions and hydrogen atoms. The hydrogen atoms combine to form hydrogen molecules.
5. The number of electrons gained during reduction must be the same as the number of electrons lost during oxidation. The reduction reaction occurs twice for every oxidation reaction, therefore 2 mol hydrogen gas is produced for every 1 mol oxygen gas, increasing the volume.
Abinethaa Paramasivam
Wiki Short Answer Questions
1)Explain how sodium can be purified by electrolysis.
Sodium can be purified by electrolysis by heating the salt until it melts and is applied to electrolysis as a molten solid. The reaction produces sodium by reduction at cathode and chlorine by oxidation at anode.
2) Describe one factor that affects electrolysis of water.
In the electrolysis of water, pure water should not be used, because it is a poor conductor of electricity. Therefore, the reaction rate will be much more slower. To increase the rate of reaction, a salt should be used which will conduct current but not interfere with the reactions. For instance, sodium sulfate can be used.
Multiple Choices
1)Who built a large galvanic cell and performed electrolysis experiments with it?
a) Sir Humphrey Dumpy
b) Sir Humphry Davy
c) Alessandro Volta
d) None of the Above
Answer: B
2)Which of the following is the correct statement about Chlor-Alkali Process?
a) Sodium ions from chlorine lose electrons
b) Chloride ions from sodium chloride gain their electrons at anode
c) Chloride ions from sodium chlorine lose their electrons at anode
d) Hydrogen atoms combine to form water molecules
Answer: C
Udari Premachandra
1. What are the two metals extensively produced for commercial purposes?
a) Potassium bromide and chlorine
b) Barium hydroxide and chlorine
c) Sodium hydroxide and chlorine
d) Calcium hydroxide and chlorine
2. What is NOT one of the uses of chlorine?
a) Used to make PVC
b) Used to break down lignin in woods
c) Used to make soaps and detergents
d) Production of ammonium
3. Which of the following is NOT one of the elements Sir Humphry Davy was able to isolate using electrolysis?
a) Sodium
b) Calcium
c) Barium
d) Beryllium
4. How did Sir Humpry Davy find out how pure sodium was obtained?
5. How can you increase the rate of reaction for electrolysis?
Answers:
1. C
2. D
3. D
4. Sir Humphry Davy found how pure sodium was obtained by heating the salts until they melted and then decided to apply electrolysis to the molten solids. Furthermore, since no water was present, it could not interfere with the reactions.
5. You can increase the rate of reaction by using a salt that will conduct current but will not interfere with the reactions.